TKAPPEAN SERIES. 23 



20 feet. The upper portion does not appear to have been altered to 

 any perceptible extent by the OYerlying trap. 



Mr. Hislopj as already mentioned^ considered that this sandstone 

 passed into gneiss. The surface of the latter rock is so much decom- 

 posed that an appearance is produced of a change from the hard 

 crystalline gneiss into the soft decomposed sandstone^ but this is merely 

 an appearance, and one not unfrequently met with. It is undoubtedly 

 deceptive, and, for reasons previously mentioned, the gneiss rock must be 

 considered as of long prior date to the sandstone. 



The sandstone is well seen along the eastern base of the hill, but 

 it is almost impossible to trace it round the southern end or amongst the 

 houses and gardens west of the hill. There is, however, every reason to 

 believe that it occurs there, and, as was pointed out by Mr. Hislop, it is 

 exposed a little farther west in the Nag stream close to the bridge on 

 the road from Nagpiir to Bisniir and Umrawati, and in some ditches 

 near the stream. The thickness here appears greater than it is beneath 

 Sitabaldi hill. The lower portion of the bed is again white tufaceous 

 gritty sandstone, congloiii critic in places and mixed with chert, which 

 does not occur east of Sitabaldi hill. Above the sandstone is a bed of 

 very compact hard grit having a cherty or jaspery texture, and breaking 

 with a conchoidal fracture, which does not appear to be calcareous. 



Thesamejaspery bed is seen north of Sitabaldi in the fields lyino- to 

 the north of the north-western branch of the road to Kdmthi. Beneath it 

 there is white gritty sandstone. A similar sandstone is seen in places 

 beneath the trap of the rise on which the Takli artillery barracks stand. 

 The bed could be traced no farther north. 



The occurrence of a few inches of cherty vesicular rock beneath 

 the trap of the little hill close to the village of Bokhara has already 

 been twice mentioned. In neighbouring hills the same bed appears to 

 be intercalated between trap flows. 



( 317 ) 



